Emergency guide for Nethermind client

Database corruption

In a case of database corruption (shortly DB corruption):

1. Stop Nethermind service

   sudo systemctl stop nethermind

2. Delete and recreate Nethermind directory

   Delete the directory

   sudo rm -r /var/lib/nethermind

   Recreate the directory

   sudo mkdir -p /var/lib/nethermind

   Set directory ownership

   sudo chown -R nethermind:nethermind /var/lib/nethermind

3. Start the service

   sudo systemctl start nethermind

   Check the service

   systemctl status nethermind

   journalctl -f -u nethermind

Once the execution chain will get synchronized, your validator will go online again.

Nethermind got stucked

If a Nethermind got stucked, you can simply restart it.

sudo systemctl restart nethermind

This can be also automated through Service Log Monitor.

There are no other serious issues with Nethermind detected.